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Q6) A three-phase synchronous generator 4.6-KV and 500-KVA and 60-HZ and 4 poles with star connection Has synchronous reactance Xc=1. 25pu The relationship between output voltage and generator excitation current is Ea = If / 7.5 pu %3D and the nominal excitation current is 15 A and the generator with infinite grid is 4.6-KV synchronous. A) Measurements show that the armature current and the excitation current are approximately at their nominal values. Draw the phasor diagram accurately and calculate the active reactive power exchanged in the network B) If the active power exchanged in the previous two parts is assumed to be infinite, then the excitation current is reduced to 80% of the nominal value. Draw the new phasor diagram on the previous phase phasor diagram and calculate the armature current and the reactive power factor. C) In part (b) at most what percentage can we reduce the excitation current without the machine going out of sync mode?

Q6) A three-phase synchronous generator 4.6-KV and 500-KVA and 60-HZ and 4 poles with star connection Has synchronous reactance Xc=1. 25pu The relationship between output voltage and generator excitation current is Ea = If / 7.5 pu %3D and the nominal excitation current is 15 A and the generator with infinite grid is 4.6-KV synchronous. A) Measurements show that the armature current and the excitation current are approximately at their nominal values. Draw the phasor diagram accurately and calculate the active reactive power exchanged in the network B) If the active power exchanged in the previous two parts is assumed to be infinite, then the excitation current is reduced to 80% of the nominal value. Draw the new phasor diagram on the previous phase phasor diagram and calculate the armature current and the reactive power factor. C) In part (b) at most what percentage can we reduce the excitation current without the machine going out of sync mode?

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Q6) A three-phase synchronous generator 4.6-KV and 500-KVA and 60-HZ and 4 poles with star connection Has synchronous reactance Xc=1. 25pu The relationship between output voltage and generator excitation current is Ea = If / 7.5 pu and the nominal excitation current is 15 A and the generator with infinite grid is 4.6-KV synchronous. A) Measurements show that the armature current and the excitation current are approximately at their nominal values. Draw the phasor diagram accurately and calculate the active reactive power exchanged in the network B) If the active power exchanged in the previous two parts is assumed to be infinite, then the excitation current is reduced to 80% of the nominal value. Draw the new phasor diagram on the previous phase phasor diagram and calculate the armature current and the reactive power factor. C) In part (b) at most what percentage can we reduce the excitation current without the machine going out of sync mode?
Transcribed Image Text:Q6) A three-phase synchronous generator 4.6-KV and 500-KVA and 60-HZ and 4 poles with star connection Has synchronous reactance Xc=1. 25pu The relationship between output voltage and generator excitation current is Ea = If / 7.5 pu and the nominal excitation current is 15 A and the generator with infinite grid is 4.6-KV synchronous. A) Measurements show that the armature current and the excitation current are approximately at their nominal values. Draw the phasor diagram accurately and calculate the active reactive power exchanged in the network B) If the active power exchanged in the previous two parts is assumed to be infinite, then the excitation current is reduced to 80% of the nominal value. Draw the new phasor diagram on the previous phase phasor diagram and calculate the armature current and the reactive power factor. C) In part (b) at most what percentage can we reduce the excitation current without the machine going out of sync mode?
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